Hermann buyten



No. 626,749. Patented lune l3, I899.

. H. BUYTEN.

SAND BLAST MACHINE FOB OPERATING ON WOOD.

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No. 626,749. Y Patent ed lune l3, I899. H. BUYTEN.

SAND BLAST MACHINE FOR OPERATING 0N WOOD.-

(Applkafiion filed June 22, 1898.

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(No Model.)

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UNITED STATES PATENT OFFICE.

HERMANN BUYTEN, OF DUSSELDORF, GERMANY.

SAND-BLAST MACHINE FOR OPERATING ON WOOD.

SPECIFICATION forming part of Letters Patent No. 626,749, dated J une 13, 1899.

Application filed J 11119 22, 1898.

T0 at whom itincty concern:

Be it known that I, HERMANN BUYTEN, a citizen of the German Empire, and a resident of Dusseldorf, Germany, have invented certain new and useful Improvements in Sand- Blast Devices to Operate Pieces of WVood, of which the following is a specification.

This invention relates to an improved sandblast apparatus for removing the softer particles from the surface of wood, particularly boards, while the harder grain remains intact, so as to form an ornamentation in relief.

In the accompanying drawings, Figure 1 is a side elevation of my improved sand-blast apparatus; Fig. 2, a plan; Fig. 3, a detail of the slides d, showing them closed; and Fig. 4, a similar detail showing the slides open.

The sand-blast device may be provided with one or more twyers. For the form of operation which is indicated on the drawings there are ten twyers arranged in two files. They are marked d. Through these the sand is thrown against the lower side of the workpiece by air, steam, or some other medium in the way already known, thereby deepening the soft parts of the wood, while the harder grains remain and appear plastically projecting. If the work-piece is subjected to the sand alone, however, the surface will not become sufficiently smooth on account of the remaining particles of sand, splinters, &c. For this reason one or, as is shown on the drawings, a number of brushes are provided for the cleaning and smoothening of the wood.

The brushes b b are actuated by a shaft 10, from which a belt leads to the shaft '1; to set the sand-blast to work. The shaft 10 puts the toothed wheel .2 into motion by means of another toothed wheel 2. The former is attached to the shaft of brush 1). The shafts of the brushes 1) and b are each provided with a conical drum it, engaged by a common belt or string m, which transmits motion from brush 1) to brush 7). This belt may be shifted backward and forward on the conical drums or pulleys a t to vary the ratio of speed between the brushes. The shifting device consists of a fork g, engaging the belt and provided with a handle g, which projects through a slot 8 of work-table a, and may be jammed Serial No. 684,115. (No model.)

or otherwise locked in position. The shifting of the fork g causes one brush to turn quicker than the other.

As the crossing of the belt or string makes one brush turn to the right and the other to the left, the board will be taken by that one of the brushes which turns the quickest, and the transportation will be the quicker the larger the diiference in the movements of the brushes.

By shifting the belt on the conical drums a quickening or slowing of the movement of one drum in opposition to the other will be attained, whereby not only the moving of the work-piece will be accelerated or retarded, but the board can also be moved in opposite directions.

The drawings show the rotating brushes placed between two files of twyers d, having their blast-openings arranged below the surface of the work which is engaged by the brushes. The twyers are adapted to be alternately put to work, that row of twyers being operated from which the work-piece is moving, whereby the operation of the sand-blast will always antecede that of the brushes. \Vhen the board or other pieces of wood will have arrived at one end of the machine, then its movement will be reversed by the shifting of the impelling device 0 in the described manner.

There may just as well be one file of twyers only, in which case the board will move only to one side during the operation. Between the files of the twyers there may be provided sliders 01, connected with each other. They have holes 0, so that the twyers of either side are open in one or the other position.

The Wood when being operated upon by the machine may be covered on certain places or spots with a material which cannot be affected by the sand-blast and the brushes, the covered spots remaining thus unchanged. In this way smooth patterns may be produced on part of the surface of the wood, of which 5 with patterns which may be projected or receding. They will remain so in spite of the working of the sand-blast and brush.

What I claim is- 1. In an apparatus for removing particles from the surface of wood, the combination of a pair of rotatable brushes adapted'to simultaneously engage the work, with means for rotating the brushes in opposite directions, and means to vary the ratio of speed between the brushes so that either brush moves alternately faster and slower than the other, substantially as specified.

2. In an apparatus for removing particles from the surface of wood, the combination of HERMANN BUYTEN.

Witnesses:

WILLIAM EssENWEIN, WALTHER FRIEDRICH. 

